What this tool does
Paste a JSON Web Token to Base64url-decode the header and payload, pretty-print JSON, and see expiry countdown. Does not verify signatures.
Example input/output
Illustrative sample — your real inputs may look different.
Example input
eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiIxMjMifQ.sig
Example output
Header: {"alg":"HS256"} · Payload: {"sub":"123"} · (signature not verified)